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About MAC address

MAC address - Media Access Control address. MAC addresses - hardware addresses that uniquely identifies each node of a network. It is assigned by the vendor or manufacturer and saved to the device memory.
According to the OSI model it is a second-level address. In IEEE 802 networks Data Link Control (DLC) layer is divided into two sub-layers: the Logical Link Control (LLC) layer and the Media Access Control (MAC) layer.
First 3 bytes (or 24 bits) of MAC addresses are known as the Organizationally Unique Identifier (OUI) and usually encodes the manufacturer.

MAC addresses usually are written in the six groups of two hexadecimal digits separated by colons (:) or hyphens (-), e.g. e8:04:62:90:07:62, 00-1E-37-18-50 DB.
It is also used in another form (e.g. vendor Cisco) - the three groups of four hexadecimal digits separated by dots (.), e.g. 0016.4d2e.7d10.
How you can identify MAC address and check MAC adress?